He remained motionless and pensive, his eyes fixed on the gloomy aperture that was open at his feet.
-- Alexandre Dumas, The Count of Monte Cristo, 1844
He made for it a large aperture with a cover pierced with numerous holes, and, taking forth some new nails, said to the young lion, Enter... The young lion therefore rejoiced at this, and advanced to the aperture; but he saw that it was narrow.
-- Edward William Lane and Edward Stanley Poole, The Thousand and One Nights, 1865
Aperture entered English in the mid-1600s from the Latin aperīre meaning "to open."